The Powerizer CH-ULLA0612A Lead Acid Smart Charger is designed for rapid charging of either 6V or 12V 3A Lead Acid Batteries. Easily select the batteries charging voltage with the toggle switch on the top. To charge, select your voltage and attach the alligator clips (red is positive) to your battery, the 45" cable makes it easy to put your charger somewhere safe (out of the reach of children). Usable worldwide, the smart charger has three chargine stages to easily charge your batteries without overcharging.